typedef struct Sale{
    char c_name[20];
    char c_address[20];
    char model[20];
    enum{XIANJIN,ZULIN,DAIKUAN} type;
    union {
        struct xianjin {
            float msrp;
            float asp;
            float st;
            float lf;
        };
        struct zulin{
            float msrp;
            float asp;
            float dp;
            float sd;
            float mp;
            int lt;
        };
        struct daikuan{
            float msrp;
            float asp;
            float st;
            float lf;
            float dp;
            int ld;
            float ir;
            float mp;
            char nob[20];
        };
    }info;
    
};